I am not sure this will apply to your 2001 but my 1996 owner's manual gave the following ranges:
4,300 LB front suspensions = 10 psi to 50 psi
5,000 LB front suspensions = 40 psi to 50 psi
5,300 LB front suspensions = 50 psi to 80 psi
5,500 LB front suspensions = 60 psi to 100 psi
For the proper adjustment it said to inflate the air bags to the maximum pressure for your vehicle, load the motor home and then reduce the air pressure as needed to level the motor home but don't reduce it below the minimum.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.